Automation System
A disadvantage of Numerical Control (NC) is:

the machine tool can easily overheat
the tape and tape reader are not reliable
one operator is needed for each machine.
the computer is not reliable
None of these

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Automation System
Relay ladder logic is used in a PC because:

it is the best industrial control language ever developed.
All of these
it is impossible to write a control program for a machine in any other logic
None of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
In raster-scan colour monitors, colour can be intensified by:

grouping the phosphor dots in a circular pattern
using an in-line gun arrangement with a solid metal mesh
having each electron gun controlled by a composite signal
None of these
having each electron gun controlled by separate signal

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Automation System
A dc servo motor:

uses a variable dc voltage for speed control
can provide precise position control
None of these
All of these
uses a tachometer for speed feedback

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